I just realized to my surprise that my Nikon D-90 has had its exposure bias adjusted to -2/3 EV for approximately the last year. I was unaware of this. I have taken a couple thousand photos. I am not sure I understand what, if any consequences this would have for me. What, exactly, does this mean? As I understand things, this means all the photos I've taken are forced to be 2/3 of a stop underexposed. Is this correct? Can I change them all in Lightroom by changing the exposure bias? Should I attempt to do so? I do not want to cause further harm but frankly don't really understand the interaction of my images and lightroom enough to know what to do (if anything) to fix. I would be grateful for any feedback/advice/help.